Video reportedly showed the Detroit man accused in the shooting death of a Wayne State University police officer at a different location at the time of the incident, forcing prosecutors Wednesday to drop murder charges against him.

DeAngelo Davis, 31, had been charged in the shooting of Wayne State University Officer Collin Rose on Nov. 22. Davis was jailed without bond after his arrest that night. He faced charges of first-degree murder and murder of a police officer.

The newly-emerged video showed Davis at an undisclosed business during the shooting, sources told WDIV.

Detroit Police Chief James Craig said at the time that Rose was investigating possible thefts of navigation systems from vehicles. Rose was shot shortly after requesting help from other officers.

"As you can imagine, the officers from the homicide task force, including the Michigan State Police and the Detroit Police Department, have been working diligently and literally ... around the clock, along with members of my office on this case," Worthy told reporters. "We all remain deeply committed to making sure that justice is done in this case, making sure that the perpetrator for the killing of Officer Rose is brought to justice."

Wayne State, which has more than 27,000 students, employs about 65 officers.

Rose, 29, died a day after the shooting and was posthumously promoted to sergeant. He was the only Wayne State officer killed in the line of duty.